The Prisoners of Breendonk: Personal Histories from a World War II Concentration Camp contains over 225 illustrations, including many photographs and drawings.
Here are the main sources:
Belgian photographer Leon Nolis
An award-winning photographer who lives near Antwerp, Leon Nolis provided the largest single group of photos for the book.
When he was young, Nolis was told that his grandfather had been interrogated at Breendonk during World War II for suspected resistance activities. For this reason, Nolis was drawn to photograph Breendonk.
When James M Deem saw some of these photographs posted online, he wrote to ask if they might be available for use in the book. This led to a meeting of the two under the clock at the Antwerp Central Station. Over the course of two years, Nolis photographed Breendonk and other related sites. He was given complete access to the memorial, so that he could photograph all aspects of the former camp. His striking and haunting work can be seen throughout the book.
Fort Breendonk, photographed by Leon Nolis
National Archives of Belgium
The next largest group of photographs found in the book was taken from the files of the Aliens' Police, housed in the National Archives of Belgium. These files contained immigration records and police documents for many residents of Belgium before and during World War II and include photographs from immigration applications and identity cards. Many of these individuals were arrested by German military police and incarcerated at Breendonk. Their photos appear throughout the book; some also appear on the cover (as shown below).
Otto Kropf Photographs
The third largest group of photographs was taken by Otto Kropf, a propaganda photographer for the SS during World War II. Assigned to document the invasion and occupation of Belgium, Kropf was asked by the commandant of Brendonk, Philipp Schmitt, to photograph the camp, an unusual request. On June 13, Kropf took a series of twenty-two photos (and fifteen more on an unknown later date). These comprise the only known images of the camp taken during World War II. Nineteen of the photos appear in the book. Another book, entitled Breendonk: Les Debuts (published in Belgium in French) contains all thirty-seven photographs.
These photos were an attempt by the Nazis to depict the "excellent conditions" at Breendonk. Most of the photos were clearly staged; the ones that weren't allow a careful observer to notice that the prisoners were abused and mistreated.